A thermonuclear bomb needs two very specific isotopes of hydrogen:

deuterium Hydrogen-2 (hydrogen with one neutron in its nucleus) and
tritium Hydrogen-3 (hydrogen with two neutrons).

is a dry powder.

These two isotopes fuse together at much lower energies than any other, allowing the bomb to function. But there is an issue. While deuterium is a naturally occurring and stable isotope which we can easily extract from water, tritium is highly radioactive, with a half-life of only 12.5 years, and as such, needs to be artificially made.

We make tritium by irradiating lithium in nuclear reactors and then painstakingly extracting the gas that is emitted. It may sound simple, but the complexity and cost of this process are astronomical, which is why tritium is one of the most expensive materials ever made at $30,000 per gram!

A large commercial nuclear power reactor produces about 20,000 Ci (~2 g) of tritium per year. This tritium is generally incorporated in the nuclear fuel and cladding.

A boosted fission weapon usually refers to a type of nuclear bomb that uses a small amount of fusion fuel to increase the rate, and thus yield, of a fission reaction. The neutrons released by the fusion reactions add to the neutrons released due to fission, allowing for more neutron-induced fission reactions to take place. The rate of fission is thereby greatly increased such that much more of the fissile material is able to undergo fission before the core explosively disassembles. The fusion process itself adds only a small amount of energy to the process, perhaps 1%.

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